28918805 has 4 divisors (see below), whose sum is σ = 34702572. Its totient is φ = 23135040.

The previous prime is 28918787. The next prime is 28918823. The reversal of 28918805 is 50881982.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (28918787) and next prime (28918823).

It can be written as a sum of positive squares in 2 ways, for example, as 13126129 + 15792676 = 3623^2 + 3974^2 .

It is not a de Polignac number, because 28918805 - 2¹² = 28914709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2891876 + ... + 2891885.

It is an arithmetic number, because the mean of its divisors is an integer number (8675643).

Almost surely, 2^28918805 is an apocalyptic number.

It is an amenable number.

28918805 is a deficient number, since it is larger than the sum of its proper divisors (5783767).

28918805 is an equidigital number, since it uses as much as digits as its factorization.

28918805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5783766.

The product of its (nonzero) digits is 46080, while the sum is 41.

The square root of 28918805 is about 5377.6207564312. The cubic root of 28918805 is about 306.9446826382.

The spelling of 28918805 in words is "twenty-eight million, nine hundred eighteen thousand, eight hundred five".